While searching the internet for same document I came across the BSI (British Standards Institution)
They have the following document for purchase as a PDF file:
https://shop.bsigroup.com/ProductDetail/?pid=000000000010554255
DD 152:1986
Database language SQL (ISO/DIS 9075)
The overview describes the document as:
Scheme definition language for declaring structures and integrity constraints of an SQL database; a module language on data manipulation language for declaring the procedures and executable statements of specific database application. Two levels.
The product details page list the following attributes:
Standard Number DD 152:1986
Title Database language SQL (ISO/DIS 9075)
Status Superseded, Withdrawn
Publication Date 30 September 1986
Withdrawn Date 29 January 1988
Normative References(Required to achieve compliance to this standard) No other standards are normatively referenced
Informative References(Provided for Information) No other standards are informatively referenced
Replaced By BS 6964:1988, ISO 9075:1987
Descriptors Data bases, Data handling, Data processing, High-level languages, Programming languages, Syntax, Data organization
ICS 35.060
Title in French Langage de base de données relationnel
Title in German Datenbanksprache SQL
Committee ICT/1
ISBN 0 580 15410 6
Publisher BSI
Format A4
Delivery No
File Size 0 KB
Price £240.00
After sending an e-mail they wrote back that the document would be available for purchase via telephone. After accepting a credit card the PDF would be sent to the recipient's e-mail address.
Thank you for your email in regards to the withdrawn standard.
The Standard DD 152 1986, is also available for purchase.
The non-members price is £240.
Please call us as instructed, and we an take payment for this order and send you the standard.
The naming convention seems to correlate with the ISO name found by McNets, so you might want to have a look.
Important Update
After asking BSI for clarification on my enquiry via e-mail:
The initial paper was/is titled "SQL-86" and was/is known under the following titles/reference numbers:
- ANSI X3.135-1986
- CAN/CSA Z243.47-88
- ISO 9075:1987
- SQL/1
- NBS FIPS 127
The original committee that drafted the paper was the "ANSI Technical Committee X3H2".
The link in your e-mail is pointing to the standard DD 152:1986
What I would like to know: Is this the same standard that I am looking for?
Is the BSI standard DD 152:1986 the same as the ISO 9075:1987 standard?
I received the following feedback:
The standard you are referring to is ISO 9075:1987 which is identical to BS 6964:1988 - https://shop.bsigroup.com/ProductDetail?pid=000000000010609544
DD 152:1986 was the previous version.
The below three standards were the first ones to come out, all in 1986:
DD 151:1986
DD 152:1986
ANSI X 3.133
So it looks like the BSI has your requested standard ISO 9075:1987 available for purchase as a PDF for a slightly lower price.
The following snippet of information was provided to me by the BSI customer service:

The overview describes the document as:
Schema definition language for declaring structures and integrity constraints of an SQL database; a module language and a data manipulation language for declaring the procedures and executable statements of specific database application. Two levels.
The product details page list the following attributes:
Standard Number BS 6964:1988, ISO 9075:1987
Title Specification for database language SQL
Status Revised, Superseded, Withdrawn
Publication Date 29 January 1988
Withdrawn Date 31 July 1990
Normative References(Required to achieve compliance to this standard) No other standards are normatively referenced
Informative References(Provided for Information) No other standards are informatively referenced
Replaced By BS 6964:1990, ISO/IEC 9075:1989
Replaces DD 152:1986
Descriptors Database languages, Syntax, Programming languages, High-level languages, Data processing, Data handling, Databases, Data organization, Semantics
ICS 35.060
Title in French Langage SQL (langage structuré d'interrogation) pour base de données. Spécifications
Title in German Datenbanksprache SQL
Committee ICT/1
ISBN 0 580 16437 3
Publisher BSI
Format A4
Delivery No
File Size 0 KB
Price £182.00
Conclusion
What I find pretty interesting is the fact that my initial research resulted in finding a standard/document (well actually three) that existed before SQL-86.